A sign in Rancho Grande, Nicaragua -- "No to mining in Rancho Grande." (Max Serjeant)

RANCHO GRANDE, Nicaragua — Father Pablo Espinosa looks down pensively, taking his time to think as he speaks. “In the history of Nicaragua there is not one town that has benefited from mining,” he says. “I have visited other communities and seen the contamination. All they have is disease and more poverty than before.” Behind…